In this talk, we discuss a first study of the QCD uncertainties on particle spectra from DM annihilation
within the same MC modelIn this work, we focused on the uncertainties within the Pythia8 event generator and the results we shown are based on [1]}.. We take the default Monash 2013 tune [2]} of the Pythia version 8.2.35 event generator [3]} as our baseline. We use a selection of experimental measurements constraining from \(e^+e^-\)  colliders preserved in the Rivet [4]} analysis package combined with the Professor [5]} parameter optimisation tool. Then, we define a small set of the systematic parameter variations which we argue that explores the uncertainty envelope for the estimate of the QCD fragmentation uncertainties on DM annihilation.
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